Liquid skin-cleaning agent composition

Abstract

This liquid skin-cleaning agent composition is characterized by containing (A) an anionic surfactant, (B) a phosphate, and (C) a disinfectant, and by having a viscosity of 150 mPa·s or less at 25°C.

Description

Liquid skin cleanser composition

[0001] The present invention relates to a liquid skin cleanser composition.

[0002] In recent years, heightened awareness of hygiene due to the spread of novel coronavirus infections has led to an increase in the frequency of daily hand washing, and various liquid skin cleanser compositions have been proposed. There is a demand for such liquid skin cleanser compositions that not only have good foam performance such as foam retention, but also provide a good cleansing sensation when washing hands.

[0003] In order to provide a liquid cleanser composition with good foam quality and low skin irritation, for example, a liquid cleanser composition containing a fatty acid salt, an amphoteric surfactant or semi-polar surfactant, and a compound with an acid dissociation index of 8.0 to 11.0 has been proposed (see, for example, Patent Document 1). Also, in order to provide a liquid skin cleanser composition with good foam performance and a good skin feel during and after cleansing, a liquid cleanser composition containing an anionic surfactant, at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, and a copolymer containing methacryloylethyldimethylbetaine and methacryloylethyltrimethylammonium chloride as structural units has been proposed (see, for example, Patent Document 2). However, none of the above proposals were satisfactory in terms of foam performance (particularly, foam density) and cleaning feel, and there was room for improvement.

[0004] Therefore, there is a need for a liquid skin cleanser composition that has good foaming performance (foam density) and provides an excellent cleansing sensation.

[0005] International Publication No. WO 2007 / 145054 International Publication No. WO 2020 / 090158

[0006] The present invention aims to solve the above-mentioned problems of the prior art and to achieve the following object: That is, the present invention aims to provide a liquid skin cleanser composition that has good foam performance (foam density) and an excellent cleansing sensation.

[0007] As a result of intensive research to achieve the above-mentioned object, the present inventors have found that a liquid skin cleanser composition containing (A) an anionic surfactant, (B) a phosphate, and (C) a bactericide and having a viscosity at 25°C of 150 mPa s or less has good foam performance (foam density) and an excellent cleaning sensation.

[0008] The present invention is based on the above-mentioned findings of the present inventors, and provides the following means for solving the above problems. That is, <1> A liquid skin cleanser composition containing (A) an anionic surfactant, (B) a phosphate, and (C) a bactericide, wherein the viscosity at 25°C is 150 mPa·s or less. <2> The liquid skin cleanser composition according to <1>, wherein the mass ratio of the content of (B) to the content of (C) [(B) / (C)] is 1 or more and 10 or less. <3> The liquid skin cleanser composition according to any of <1> to <2>, wherein the component (A) contains a palmitate. <4> The liquid skin cleanser composition according to any of <1> to <3>, further containing (D) monoethanolamine and (E) a fragrance, wherein the mass ratio of the content of (D) to the content of (A) [(D) / (A)] is 0.08 or more and 0.5 or less. <5> The liquid skin cleanser composition according to any one of <1> to <4>, wherein the content of (A) is 1% by mass or more and 25% by mass or less, based on the total amount of the liquid skin cleanser composition, the content of (B) is 0.05% by mass or more and 5% by mass or less, based on the total amount of the liquid skin cleanser composition, and the content of (C) is 0.05% by mass or more and 1% by mass or less, based on the total amount of the liquid skin cleanser composition. <6> The liquid skin cleanser composition according to any one of <1> to <5>, which is filled in a former container.

[0009] According to the present invention, the above-mentioned conventional problems can be solved, the above-mentioned objects can be achieved, and a liquid skin cleanser composition having good foam performance (foam density) and an excellent cleansing sensation can be provided.

[0010] (Liquid Skin Cleanser Composition) The liquid skin cleanser composition of the present invention contains (A) an anionic surfactant, (B) a phosphate, and (C) a bactericide, and may optionally contain (D) monoethanolamine, (E) a fragrance, (F) a copolymer containing dimethyldiallylammonium chloride and at least one of acrylic acid and acrylamide as monomer units, and other components. Furthermore, the liquid skin cleanser composition of the present invention is characterized by having a viscosity at 25°C of 150 mPa s or less. In this specification, "(A) anionic surfactant" may be referred to as "(A)" or "(A) component," "(B) phosphate" may be referred to as "(B)" or "(B) component," "(C) disinfectant" may be referred to as "(C)" or "(C) component," "(D) monoethanolamine" may be referred to as "(D)" or "(D) component," "(E) fragrance" may be referred to as "(E)" or "(E) component," and "(F) copolymer containing dimethyldiallylammonium chloride and at least one of acrylic acid and acrylamide as monomer units" may be referred to as "(F)," "(F) component," or "(F) copolymer."

[0011] <(A) Anionic Surfactant> The anionic surfactant as the component (A) is contained mainly to improve the cleansing feel. In this specification, the term "cleaning feel" refers to a refreshing feeling upon rinsing, without stickiness or sliminess due to dirt or the like.

[0012] The anionic surfactant for component (A) is not particularly limited and can be appropriately selected depending on the purpose. Examples include higher fatty acid salts, polyoxyethylene (POE) alkyl ether sulfates, alkyl phosphate ester salts, polyoxyethylene (POE) alkyl ether phosphate salts, alkyl sulfosuccinates, polyoxyethylene (POE) alkyl sulfosuccinate salts, N-acylmethyl taurines, N-acyl sarcosines, acylated isethionates, polyoxyethylene fatty acid amide ether sulfates, ether carboxylates, and amino acid surfactants. Among these, from the viewpoints of achieving a good cleansing feel, no lingering fragrance after cleansing, and a thick foam, higher fatty acid salts, polyoxyethylene (POE) alkyl ether sulfates, and ether carboxylates are preferred, and higher fatty acid salts are more preferred. These may be used alone or in combination of two or more.

[0013] The content of the anionic surfactant is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoints of achieving a good cleaning feel, no lingering fragrance after cleansing, and a dense foam, it is preferably 1.0% by mass or more and 25% by mass or less, and more preferably 3% by mass or more and 7% by mass or less, relative to the total amount of the liquid skin cleanser composition. It is preferable that the content of (A) is 1.0% by mass or more, relative to the total amount of the liquid skin cleanser composition, because the cleaning feel and the dense foam are good. It is also preferable that the content of (A) is 25% by mass or less, relative to the total amount of the liquid skin cleanser composition, because the cleaning feel and the dense foam are good.

[0014] -Higher fatty acid salt- The higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose, and examples include laurate, myristate, palmitate, stearate, etc. Among these, laurate, myristate, and palmitate are preferred from the viewpoints of achieving a good cleansing feel, no lingering fragrance after cleansing, and a good foam density. These may be used alone or in combination of two or more.

[0015] From the viewpoint of improving retention of the disinfectant, (A) preferably contains one or more palmitates, and in this case, the content of the palmitate is preferably 0.1% by mass or more and 4% by mass or less, and more preferably 0.4% by mass or more and 1% by mass or less, based on the total amount of the liquid skin cleanser composition.

[0016] The higher fatty acid salt may be appropriately synthesized or may be a commercially available product. Examples of commercially available higher fatty acid salts include, by trade name, NIKKOL potassium laurate LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL potassium myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), and TYSOAP MNK-40 (liquid blend of potassium coconut oil fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.).

[0017] The higher fatty acid salt can be blended as a higher fatty acid salt, or the higher fatty acid and a counterion salt can be added separately to a blending tank and neutralized to form the higher fatty acid salt. The counterion is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include alkali metal ions, alkanolamines, and basic amino acids. Examples of the alkali metal ions include sodium ions and potassium ions. Examples of the alkanolamines include monoethanolamine, diethanolamine, and triethanolamine. Examples of the basic amino acids include lysine and arginine.

[0018] The higher fatty acid used to prepare the higher fatty acid salt may be an appropriately synthesized product or a commercially available product. Examples of commercially available higher fatty acids include NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA (registered trademark)-142 (myristic acid, manufactured by NOF Corporation), NAA (registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), and NAA (registered trademark)-180 (stearic acid, manufactured by NOF Corporation).

[0019] -Polyoxyethylene (POE) alkyl ether sulfate- The polyoxyethylene (POE) alkyl ether sulfate is not particularly limited and can be appropriately selected depending on the purpose, and examples include compounds represented by the following general formula (A1): The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more types.

[0020]

[0021] In the general formula (A1), R １ represents an alkyl group, and the number of carbon atoms in the alkyl group moiety is preferably 10 to 14. In general formula (A1), n ​​represents the average number of moles of ethylene oxide (E.O.) added, and the average number of moles of ethylene oxide added is preferably 1 to 5. In general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected depending on the purpose, and examples include sodium and potassium.

[0022] Specific examples of the polyoxyethylene (POE) alkyl ether sulfate include polyoxyethylene (1) lauryl ether sodium sulfate, polyoxyethylene (2) lauryl ether sodium sulfate (also known as POE (2) sodium laureth sulfate), polyoxyethylene (3) lauryl ether sodium sulfate (also known as POE (3) sodium laureth sulfate), polyoxyethylene (4) lauryl ether sodium sulfate, polyoxyethylene (5) lauryl ether sodium sulfate, polyoxyethylene (3) alkyl (C12,13) ​​ether sodium sulfate, polyoxyethylene (2) lauryl ether ammonium sulfate, polyoxyethylene (3) lauryl ether ammonium sulfate, etc. The number in parentheses indicates the average number of moles (n) of ethylene oxide (E.O.) added.

[0023] The polyoxyethylene alkyl ether sulfate may be suitably synthesized or may be a commercially available product. Examples of commercially available polyoxyethylene alkyl ether sulfates include polyoxyethylene (1) sodium lauryl ether sulfate (trade name: EMALE 125A, manufactured by Kao Corporation), polyoxyethylene (2) sodium lauryl ether sulfate (manufactured by New Japan Chemical Co., Ltd.), polyoxyethylene (3) sodium lauryl ether sulfate (trade name: EMALE 20C, manufactured by Kao Corporation), polyoxyethylene (1) ammonium lauryl ether sulfate (manufactured by Kao Corporation), and polyoxyethylene (3) ammonium lauryl ether sulfate (manufactured by Teika Corporation).

[0024] The ether carboxylate may be selected appropriately depending on the purpose without any particular limitation, and examples thereof include compounds represented by the following general formula (A2) or (A3): The ether carboxylate may be used alone or in combination of two or more types.

[0025]

[0026] In the general formulas (A2) and (A3), R ２ represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. ２ The number of carbon atoms in the R moiety is preferably 10 to 14. ３ may be the same or different and represent an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms. In the general formula (A2), o represents the average number of moles of alkylene oxide added of 1 to 20. The average number of moles of alkylene oxide added is preferably 1 to 5. In the general formulas (A2) and (A3), M １represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid. Among these, polyoxyalkylene alkyl ether carboxylates are preferred from the viewpoints of achieving a good cleaning feel, no lingering fragrance after cleaning, and a thick foam. As the polyoxyalkylene alkyl ether carboxylate, polyoxyethylene (POE) alkyl ether acetate is preferred.

[0027] Specific examples of the ether carboxylate salt represented by the general formula (A2) or (A3) include polyoxyethylene (3) lauryl ether sodium acetate, polyoxyethylene (4) lauryl ether potassium acetate, sodium lauryl glycol acetate, etc. The number in the parentheses indicates the average number of moles of alkylene oxide added.

[0028] The ether carboxylate may be suitably synthesized or may be a commercially available product. Commercially available ether carboxylates include, for example, trade names such as Energicol EC-30 (polyoxyethylene (3) lauryl ether sodium acetate, manufactured by Lion Specialty Chemicals Co., Ltd.), Viewrite LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), Viewrite LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), Viewrite LCA-H (polyoxyethylene (4) lauryl ether acetic acid), Viewrite LCA-25NH (laureth-4 carboxylic acid), Viewrite SHAA (sodium lauryl glycol carboxylate), Viewrite LCA (polyoxyethylene (3) lauryl ether sodium acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), Kaoakipo RLM-45NV (polyoxyethylene (4.5) lauryl ether sodium acetate), and Kaoakipo RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (all manufactured by Kao Corporation). The numbers in the parentheses indicate the average number of moles of alkylene oxide added.

[0029] The amino acid-based surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A4): The amino acid-based surfactant may be used alone or in combination of two or more types.

[0030]

[0031] In the general formula (A4), R ４ represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. ４ The number of carbon atoms in the R moiety is preferably 8 to 18. ５ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. ６ and R ７ may be the same or different, and each represents a hydrogen atom or -(CH ２ ) ｍ -COOM ３ In the general formula (A4), m and n may be the same or different and represent a number from 0 to 20. In the general formula (A4), M ２ and M ３ may be the same or different and represent a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

[0032] The amino acid structure of the hydrophilic portion of the amino acid surfactant is not particularly limited and can be appropriately selected depending on the purpose, but glycine, glutamic acid, and methylalanine are preferred.

[0033] Specific examples of the amino acid surfactant represented by general formula (A4) include N-acylglycines and salts thereof, such as N-cocoylglycine potassium (N-cocoylglycine potassium), N-acyl-N-carboxyethyl-glycines and salts thereof, such as N-myristoyl-N-carboxyethyl-glycine sodium, N-acylglutamic acid and salts thereof, such as N-myristoyl-L-glutamate sodium, N-myristoyl-L-glutamate potassium, N-cocoyl-L-glutamate potassium, N-palm fatty acyl-L-glutamate sodium, and N-stearoyl-L-glutamate sodium, and N-lauroyl-N-methyl-β-alanine potassium.

[0034] The amino acid surfactant may be appropriately synthesized or a commercially available product. Examples of commercially available amino acid surfactants include, by trade name, Amirite (registered trademark) GCK-11 (potassium N-cocoylglycine), Amirite (registered trademark) GCK-12K (potassium N-cocoylglycine), Amirite (registered trademark) GCS-12K (sodium N-cocoylglycine), Amirite (registered trademark) GCS-11 (sodium N-cocoylglycine), Amisoft (registered trademark) CS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) LS-11 (N-lauroyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) LS-11 (sodium N-lauroyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-co ...CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark Sodium glutamate), Amisoft® MS-11 (N-myristoyl-L-glutamate), Amisoft® HS-11P (N-stearoyl-L-glutamate), Amisoft® HS-11P(F) (N-stearoyl-L-glutamate), Amisoft® HS21 (N-stearoyl-L-glutamate disodium), Amirite® ACS-12 (cocoyl alanine sodium) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), AminoSurfact® AMMS-P1 (N-myristoyl-L-glutamate) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Examples of such an active ingredient include Sarcosinate MN (sodium myristoylmethylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroylmethyl-β-alanine) (all manufactured by Nikko Chemicals Co., Ltd.), Alanon ACE (sodium coconut oil fatty acid methylalanine), Alanon AME (sodium myristoylmethyl-β-alanine), Alanon ALE (sodium lauroylmethyl-β-alanine) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Enerdicol L-30AN (sodium lauroylmethyl-β-alanine) (manufactured by Lion Specialty Chemicals Co., Ltd.), and Softilt AT-L (sodium lauroylmethyl-β-alanine) (manufactured by NOF Corporation).

[0035] <(B) Phosphate> The phosphate is blended to improve the cleansing sensation.

[0036] The (B) phosphate salt is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate, potassium polyphosphate, sodium polyphosphate, sodium pyrophosphate, sodium dihydrogen phosphate, sodium phosphate, sodium tripolyphosphate, disodium hydrogen phosphate, and calcium hydrogen phosphate. Among these, potassium dihydrogen phosphate is preferred from the viewpoint of providing a good cleansing feel and foam density. These salts may be used alone or in combination of two or more.

[0037] The content of the (B) phosphate is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of achieving a good cleaning feel and foam density, it is preferably from 0.05 to 5 mass%, and more preferably from 0.2 to 1.0 mass%, relative to the total amount of the liquid skin cleanser composition. When the content of the (B) phosphate is 0.05 mass% or more relative to the total amount of the liquid skin cleanser composition, the cleaning feel and foam density are good, which is preferable. When the content of the (B) phosphate is 5 mass% or less relative to the total amount of the liquid skin cleanser composition, the cleaning feel is good, which is preferable.

[0038] The (B) phosphate may be appropriately synthesized or may be a commercially available product. Examples of commercially available (B) phosphates include potassium dihydrogen phosphate (trade name: potassium phosphate, manufactured by Taihei Chemical Industry Co., Ltd.), dipotassium hydrogen phosphate (trade name: dipotassium phosphate, manufactured by Taihei Chemical Industry Co., Ltd.), potassium tripolyphosphate (trade name: potassium tripolyphosphate, manufactured by Taihei Chemical Industry Co., Ltd.), sodium tripolyphosphate (trade name: sodium tripolyphosphate, manufactured by Taihei Chemical Industry Co., Ltd.), sodium dihydrogen phosphate (trade name: monosodium phosphate (anhydrous), manufactured by Taihei Chemical Industry Co., Ltd.), and sodium phosphate (trade name: trisodium phosphate (anhydrous), manufactured by Taihei Chemical Industry Co., Ltd.).

[0039] <(C) Bactericide> The (C) bactericide is blended to improve the cleaning sensation.

[0040] The disinfectant (C) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include isopropylmethylphenol, salicylic acid, triclosan, benzalkonium chloride, cetylpyridinium chloride, etc. Among these, isopropylmethylphenol is preferred from the viewpoint of providing a good cleaning feel.

[0041] The content of the (C) bactericide is not particularly limited and can be set appropriately depending on the purpose, but from the viewpoint of the cleaning sensation, it is preferably from 0.05 to 1.0 mass%, more preferably from 0.05 to 0.4 mass%, based on the total amount of the liquid skin cleanser composition. When the content of the (C) bactericide is from 0.05 to 1.0 mass%, based on the total amount of the liquid skin cleanser composition, it is preferable because it improves the cleaning sensation.

[0042] The (C) disinfectant may be appropriately synthesized or may be a commercially available product. Examples of commercially available products of the (C) disinfectant include isopropylmethylphenol (trade name: Biosol (registered trademark), manufactured by Osaka Kasei Co., Ltd.), salicylic acid (trade name: Salicylic Acid, manufactured by API Corporation), benzalkonium chloride (trade name: Cation G-50, manufactured by Sanyo Chemical Industries, Ltd.), and cetylpyridinium chloride (trade name: Cetylpyridinium chloride (CPC), manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.).

[0043] <(D) Monoethanolamine> As described above, the liquid skin cleanser composition of the present invention may optionally contain (D) monoethanolamine. The (D) monoethanolamine is blended to improve the cleansing sensation and the absence of lingering fragrance after cleansing.

[0044] The content of the (D) monoethanolamine is not particularly limited and can be set appropriately depending on the purpose, but from the viewpoints of the cleansing sensation and the lack of lingering fragrance after cleansing, it is preferably from 0.3 to 3.0 mass%, and more preferably from 0.6 to 2.0 mass%, relative to the total amount of the liquid skin cleanser composition. When the content of the (D) monoethanolamine is 0.3 mass% or more relative to the total amount of the liquid skin cleanser composition, the lack of lingering fragrance after cleansing is favorable. When the content of the (D) monoethanolamine is 3.0 mass% or less relative to the total amount of the liquid skin cleanser composition, the lack of lingering fragrance is favorable.

[0045] The monoethanolamine (D) may be an appropriately synthesized product or a commercially available product, such as monoethanolamine (manufactured by Nippon Shokubai Co., Ltd.).

[0046] <(E) Fragrance> As described above, the liquid skin cleanser composition of the present invention may contain a fragrance (E) if necessary. The fragrance (E) is blended for the purpose of adding a fragrance.

[0047] The (E) fragrance is not particularly limited and can be appropriately selected depending on the purpose. For example, the fragrances described in JP-A-2002-128658, the fragrances described in JP-A-2003-73249, or the blended fragrance compositions described in JP-A-2020-132680 can be used.

[0048] The content of the fragrance (E) is not particularly limited and can be set appropriately depending on the purpose, but from the viewpoint of leaving no fragrance after cleansing, it is preferably from 0.05 to 2.0 mass% and more preferably from 0.1 to 1.0 mass% based on the total amount of the liquid skin cleanser composition. When the content of the fragrance (E) is 2.0 mass% or less based on the total amount of the liquid skin cleanser composition, the remaining fragrance after cleansing is favorable, which is preferable.

[0049] <(F) Copolymer containing dimethyldiallylammonium chloride and at least one of acrylic acid and acrylamide as monomer units> The component (F) is blended to improve the cleaning sensation.

[0050] The component (F) is preferably a copolymer of (F1) dimethyldiallylammonium chloride and (F2) acrylic acid and / or acrylamide. More specifically, the copolymer of the component (F) is preferably a copolymer represented by the following general formula (2):

[0051] In the general formula (2), n, m, and z represent the molar ratio of each monomer unit, and n+m+z=100. Furthermore, n and z cannot be 0 at the same time.

[0052] The molar ratio of the (F1) dimethyldiallylammonium chloride in the (F) copolymer is not particularly limited and can be appropriately set depending on the purpose. From the viewpoint of improving the cleaning feel, however, it is preferably 10 mol % or more and 95 mol % or less, and more preferably 20 mol % or more and 50 mol % or less. The ratio of each monomer in the (F) component can be determined by measuring by nuclear magnetic resonance (NMR) under the following measurement conditions. [Measurement conditions] Solvent: heavy water (D ２ O) Measuring instrument: JNM-LA300 (300 MHz, manufactured by JEOL Ltd.)

[0053] The content of the component (F) is not particularly limited and can be set appropriately depending on the purpose, but from the viewpoint of the cleaning sensation and foam density, it is preferably from 0.01 to 0.5 mass%, and more preferably from 0.01 to 0.1 mass%, relative to the total amount of the liquid skin cleanser composition. When the content of the component (F) is 0.01 mass% or more relative to the total amount of the liquid skin cleanser composition, the cleaning sensation becomes good, and therefore it is preferable. When the content of the component (F) is 0.1 mass% or less relative to the total amount of the liquid skin cleanser composition, the cleaning sensation and foam density become good, and therefore it is preferable.

[0054] The copolymer of component (F) may be a synthesized copolymer or a commercially available product. Examples of commercially available products of component (F) include the following. These may be used alone or in combination of two or more.

[0055] -MERQUAT 280- Composition (molar ratio): acrylic acid:dimethyldiallylammonium chloride = 35:65 Solids content: 39% by mass to 43% by mass Viscosity at 25°C: 3,000 mPa·s to 6,000 mPa·s Weight average molecular weight: 450,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C using a spindle No. 4 rotor at 60 revolutions per minute.

[0056] -MERQUAT 295- Composition (molar ratio): acrylic acid:dimethyldiallylammonium chloride = 5:95 Solids content: 35% to 40% by mass Viscosity at 25°C: 3,500 mPa·s to 9,000 mPa·s Weight average molecular weight: 150,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C using a spindle No. 4 rotor at 30 revolutions per minute.

[0057] -MERQUAT 550 (MERQUAT) PR- Composition (molar ratio): acrylamide: dimethyldiallylammonium chloride = 70:30 Solids content: 8.8% by mass to 9.8% by mass Viscosity at 25°C: 75,000 mPa·s to 150,000 mPa·s Weight average molecular weight: 1,600,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C using a spindle No. 4 rotor at 10 revolutions per minute.

[0058] -MERQUAT 740- Composition (molar ratio): acrylic acid:dimethyldiallylammonium chloride = 24:76 Solids content: 41% by mass to 45% by mass Viscosity at 25°C: 1,200 mPa·s to 4,500 mPa·s Weight average molecular weight: 120,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C using a spindle No. 3 rotor at 10 revolutions per minute.

[0059] [Mass Ratio (B) / (C)] In this specification, the "mass ratio of the content of (B) to the content of (C)" may be referred to as the "mass ratio (B) / (C)." The mass ratio (B) / (C) is not particularly limited and can be set appropriately depending on the purpose, but from the viewpoint of cleaning feel, it is preferably 1 or more and 10 or less, and more preferably 2 or more and 3 or less. The mass ratio (B) / (C) of 1 or more and 10 or less is preferred because it improves the cleaning feel.

[0060] [Mass Ratio (D) / (A)] In this specification, the "mass ratio of the content of (D) to the content of (A)" may be referred to as the "mass ratio (D) / (A)". There are no particular limitations on the mass ratio (D) / (A) and it can be set appropriately depending on the purpose. However, from the viewpoint of the cleaning feel and the absence of fragrance after cleaning, it is preferably 0.08 or more and 0.5 or less, and more preferably 0.2 or more and 0.4 or less. A mass ratio (D) / (A) of 0.08 or more is preferable because it provides a good cleaning feel and the absence of lingering fragrance after cleaning. A mass ratio (D) / (A) of 0.5 or less is preferable because it provides a good cleaning feel.

[0061] <Other Components> In addition to the components (A), (B), (C), (D), (E), and (F), the liquid skin cleanser composition of the present invention may contain, as necessary, other components that are typically used in liquid skin cleanser compositions, etc., within a range that does not impair the effects of the present invention.

[0062] The other components are not particularly limited and can be appropriately selected depending on the purpose. Examples of the other components include surfactants other than the component (A), water-soluble polymers other than the component (F), oils, silicones, alcohols, lanolin derivatives, protein derivatives, amino acids, vitamins and other pharmaceutical agents, preservatives, pH adjusters, antioxidants, sequestering agents, animal and plant extracts or derivatives thereof, chelating agents, moisturizers, thickeners, ultraviolet absorbers or scattering agents, colorants, pigments, and water-insoluble polymer compound powders.

[0063] The oil is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include vegetable oils and fats such as castor oil, olive oil, cacao oil, hardened palm oil, camellia oil, coconut oil, Japan wax, jojoba oil, grapeseed oil, and avocado oil, and ester compounds thereof; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, spermaceti, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These may be used alone or in combination of two or more. The content of the oil is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.1% by mass or more and 3% by mass or less based on the total amount of the liquid skin cleanser composition.

[0064] The alcohols are not particularly limited and can be selected appropriately depending on the purpose, and may be lower alcohols or higher alcohols. Specific examples of the alcohols include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. These may be used alone or in combination of two or more. The content of the alcohols is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.01% by mass or more and 15% by mass or less relative to the total amount of the liquid skin cleanser composition.

[0065] The humectant is not particularly limited and can be selected appropriately depending on the purpose, and examples thereof include isoprene glycol, propylene glycol, glycerin, sorbitol, 1,3-butylene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, polyglycerin, etc. These may be used alone or in combination of two or more. The content of the humectant is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.01% by mass or more and 10.0% by mass or less relative to the total amount of the liquid skin cleanser composition.

[0066] The thickener is not particularly limited and can be selected appropriately depending on the purpose, and examples thereof include natural polymers such as sodium alginate, xanthan gum, aluminum silicate, quince seed extract, tragacanth gum, and starch; semi-synthetic polymers such as methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and soluble starch; and synthetic polymer compounds such as carboxyvinyl polymer, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, and methacryloylethyl betaine-methacrylic acid ester copolymer. These may be used alone or in combination of two or more. The content of the thickener is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less relative to the total amount of the liquid skin cleanser composition.

[0067] The preservative is not particularly limited and can be selected appropriately depending on the purpose. Examples include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone-methylisothiazolinone solution (trade name: KASSON CG, manufactured by Rohm and Haas Japan), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used alone or in combination of two or more. The content of the preservative is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less, based on the total amount of the liquid skin cleanser composition.

[0068] The antioxidant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, etc. These may be used alone or in combination of two or more. The content of the antioxidant is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.001% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleanser composition.

[0069] The chelating agent is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include edetic acid, edetate disodium, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. These may be used alone or in combination of two or more. The content of the chelating agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.001% by mass or more and 5.0% by mass or less relative to the total amount of the liquid skin cleanser composition.

[0070] The pH adjuster is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, hydrochloric acid, etc. These may be used alone or in combination of two or more.

[0071] The ultraviolet absorber or scattering agent is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl para-aminobenzoate, ethylhexyl para-methoxycinnamate, titanium oxide, kaolin, talc, etc. These may be used alone or in combination of two or more. The content of the ultraviolet absorber or scattering agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less, based on the total amount of the liquid skin cleanser composition.

[0072] The vitamins are not particularly limited and can be selected appropriately depending on the purpose, and examples thereof include vitamin A, B vitamins, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid, and derivatives thereof. These may be used alone or in combination of two or more. The content of the vitamins is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less, based on the total amount of the liquid skin cleanser composition.

[0073] The amino acids are not particularly limited and can be selected appropriately depending on the purpose, and examples thereof include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and derivatives thereof. These may be used alone or in combination of two or more. The content of the amino acids is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleanser composition.

[0074] The water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include inorganic powders, clay minerals, nylon, polyethylene, etc. These may be used alone or in combination of two or more. The content of the water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1 mass% or less based on the total amount of the liquid skin cleanser composition.

[0075] The other components may be appropriately synthesized or commercially available products. The content of the other components relative to the total amount of the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose.

[0076] - pH - The pH of the liquid skin cleanser composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 9.5 to 11.0, and more preferably 9.8 to 10.6. When an anionic surfactant other than a higher fatty acid salt is used as component (A), the pH of the liquid skin cleanser composition at 25°C is preferably 4.0 to 7.0, and more preferably 4.0 to 5.0. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (electrode type GST-5721, manufactured by TOA DKK Corporation).

[0077] - Viscosity - The viscosity of the liquid skin cleanser composition at 25°C is 150 mPa s or less. From the viewpoints of achieving a good cleaning feel, no lingering fragrance after cleansing, and dense foam, the viscosity of the liquid skin cleanser composition at 25°C is preferably 90 mPa s or less, more preferably 50 mPa s or less. The viscosity can be measured, for example, using a BM-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) at a sample temperature of 25°C, at a rotation speed of 60 rpm, with a No. 1 rotor, after 1 minute.

[0078] - Container - The liquid skin cleanser composition of the present invention is filled into a conventional container for use, without any particular limitation. The container is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a pump dispenser container, a tube, a former container, and a bag-shaped container. Among these, a former container is preferred.

[0079] The former container is not particularly limited and can be appropriately selected from known former containers, for example, a non-gas type foam discharging container, an aerosol container using a propellant and a pressure-resistant container, etc. Among these, a non-gas type foam discharging container is preferred.

[0080] The non-gas foam-dispensing container is not particularly limited and can be appropriately selected depending on the purpose, as long as it can mix the liquid skin cleanser composition with air and dispense it in a foamed state. Examples include a squeeze foamer container that can dispense foam by manually squeezing the bottle body, and a pump foamer container that can dispense foam by pressing down the nozzle. Such foamer containers can be manufactured by Yamato Seikan Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, examples of foamer containers that can be used include those described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972.

[0081] The non-gas type foam-dispensing container has a foam-forming member, specifically a porous membrane body (preferably made of a plastic material such as nylon, polyester, or polyolefin) for forming foam, and foam is formed when the liquid skin cleanser composition passes through the porous membrane body.

[0082] The mesh of the porous membrane body is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 100 mesh or more, more preferably 100 to 400 mesh, and particularly preferably 200 to 305 mesh. The number of porous membrane bodies is also not particularly limited and can be appropriately selected depending on the purpose, but is preferably 2 to 4 from the viewpoint of improving foam performance.

[0083] -Production Method- The method for producing the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose. For example, the liquid skin cleanser composition can be obtained by mixing the components (A), (B), (C), (D), (E), and (F), and, if necessary, the other components, and purified water (blended as the remainder so that the total amount of the liquid skin cleanser composition becomes 100% by mass). Specifically, the liquid skin cleanser composition can be obtained by dissolving the anionic surfactant (A), the phosphate (B), the bactericide (C), the monoethanolamine (D), and potassium hydroxide (another component) in purified water heated to 70°C to 80°C, cooling the water to 40°C or below, and then adding and dissolving the fragrance (E) and the copolymer (F).

[0084] The liquid skin cleanser composition may be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a stirring apparatus equipped with stirring blades that exert shear force and can mix the entire composition. The stirring blade is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a propeller, a turbine, a disperser, etc.

[0085] - Use - The area on which the liquid skin cleanser composition is used is not particularly limited and can be appropriately selected depending on the purpose, and it can be used on, for example, the whole body, face, hands, etc. The method of using the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose, but it is preferable to fill the composition into a foamer container and discharge it in the form of foam for use.

[0086] The liquid skin cleanser composition has good foaming performance (foam density) and excellent cleansing sensation, and can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in body soaps.

[0087] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. The content of each component described in the examples and comparative examples is shown in "% by mass", the total amount is 100% by mass, and all values ​​are converted into pure contents.

[0088] Examples 1 to 23 and Comparative Examples 1 to 4 Liquid skin cleanser compositions having the compositions and contents shown in Examples 1 to 23 and Comparative Examples 1 to 4 were prepared according to the following method. Specifically, using other ingredients such as purified water and propylene glycol, a mixture was prepared in an amount that would account for 60% by mass of the total amount of the final liquid skin cleanser composition. The mixture of other ingredients was heated to 70°C to 80°C, and then (A) anionic surfactant, (B) phosphate, (C) bactericide, (D) monoethanolamine, and other ingredient potassium hydroxide were dissolved therein. The mixture was then cooled to 40°C or below, and (E) fragrance and (F) dimethyldiallylammonium chloride-acrylamide copolymer liquid were added and dissolved therein. Thereafter, if the predetermined pH was not reached, potassium hydroxide, a common ingredient, was added to adjust the pH to 10, and purified water was added so that the total amount became 100% by mass, thereby obtaining the liquid skin cleanser compositions of the Examples and Comparative Examples. The components were mixed using a propeller as a stirring blade and a Three-One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.). The pH was measured at 25°C using a pH meter (HM-30R, manufactured by TOA DKK Corporation). The viscosity of the obtained liquid skin cleanser composition was measured at 25°C using a BM-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) with a spindle No. 1 rotor at 25°C and a rotation speed of 60 rpm for 1 minute after being kept at a constant temperature of 25°C. The obtained liquid skin cleanser compositions of Examples 1 to 23 and Comparative Examples 1 to 4 were filled into a container equipped with a foamer pump dispenser (discharge volume 1 mL, manufactured by Yoshino Kogyosho Co., Ltd.).

[0089] Each liquid skin cleanser composition was evaluated and judged for "cleaning sensation," "foam density," "lack of lingering fragrance after cleansing," and "retention of disinfectant" as follows. The results are shown in Tables 1 to 6 below.

[0090] <Cleaning Experience> Ten expert evaluators took two pumps (approximately 2 g) of each liquid skin cleanser composition into their hands, lathered it, and then rinsed it twice per second, and evaluated the cleaning experience based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 evaluators, and judged based on the following evaluation criteria for the average score. A score of "Good" or better was considered a pass. -Evaluation criteria- 5 points: Very strong squeezing sensation 4 points: Strong squeezing sensation 3 points: Squeezing sensation 2 points: Slight squeezing sensation 1 point: No squeezing sensation -Evaluation criteria- ◎◎: 4.5 points or more ◎: 4.0 points or more but less than 4.5 points ○: 3.0 points or more but less than 4.0 points △: 2.0 points or more but less than 3.0 points ×: Less than 2.0 points

[0091] <Foam Denseness> Ten expert evaluators took two pumps (approximately 2 g) of each liquid skin cleanser composition into their hands, rubbed them back and forth 10 times, and then pressed the foam together with both hands. The feel of the foam rebounding and the resistance to dripping when the hands were tilted at a 45-degree angle were observed and evaluated based on the following evaluation criteria. The results were calculated by calculating the average score from the 10 evaluators and judging based on the following evaluation criteria for the average score. A score of "△" or higher was rated as passing. -Evaluation criteria- 4 points: The foam is hard and does not drip even when the hand is tilted 3 points: The foam is somewhat hard and does not drip even when the hand is tilted 2 points: The foam is somewhat soft and tends to drip when the hand is tilted 1 point: The foam is soft and drips when the hand is tilted -Evaluation criteria- ◎: 3.5 points or higher ○: 3.0 points or higher but less than 3.5 points △: 2.0 points or higher but less than 3.0 points ×: Less than 2.0 points

[0092] <Method for evaluating lack of fragrance after cleansing> After evaluating the cleaning sensation of each liquid skin cleanser composition as described above, the same panelist immediately smelled the fragrance remaining on their hands and evaluated the fragrance remaining on the hands according to the following evaluation criteria. The results were calculated by calculating the average score of 10 panelists and judging based on the following evaluation criteria for the average score. A score of "△" or higher was considered to be acceptable. -Evaluation criteria- 5 points: No fragrance remains on the hands at all 4 points: Almost no fragrance remains on the hands 3 points: The fragrance remains on the hands 2 points: The fragrance remains strongly on the hands 1 point: The fragrance remains very strongly on the hands -Evaluation criteria- ◎: 4.0 points or more 〇: 3.0 points or more but less than 4.0 points △: 2.0 points or more but less than 3.0 points ×: Less than 2.0 points

[0093] <Retention of disinfectant component after washing> Approximately 100 μL of each liquid skin cleanser composition was applied to model skin (VITRO-SKIN, 5×5), which was then immersed in 20 mL of water for 5 seconds and allowed to air dry for 1 to 2 hours. Methanol was added to the model skin and ultrasonically treated to obtain a solution, which was then filtered through a 0.45 μm filter and the disinfectant content was measured by liquid chromatography. The disinfectant retention rate (%) was calculated, assuming the disinfectant content in the liquid skin cleanser composition to be 100, and evaluated based on the following evaluation criteria. - Evaluation criteria - ◎: Retention rate of 30% or more ○: Retention rate of 20% or more but less than 30% △: Retention rate of 10% or more but less than 20% ×: Retention rate less than 10%

[0094]

[0095]

[0096]

[0097]

[0098]

[0099]

[0100] Formulation Examples 1 to 6 Liquid skin cleansing compositions having the compositions and contents shown in Table 7 below were prepared in the same manner as in Example 1.

[0101]

[0102] Details of each component used in Examples 1 to 23, Comparative Examples 1 to 4, and Formulation Examples 1 to 6 are shown in Table 8 below.

[0103] *1: Potassium myristate was prepared by neutralizing myristic acid (NAA-142, NOF Corporation) with potassium hydroxide (liquid caustic potash, AGC Inc.). *2: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, NOF Corporation) with potassium hydroxide (liquid caustic potash, AGC Inc.). *3: Potassium palmitate was prepared by neutralizing palmitic acid (NAA-160, NOF Corporation) with potassium hydroxide (liquid caustic potash, AGC Inc.). *4: Potassium stearate was prepared by neutralizing stearic acid (NAA-180, NOF Corporation) with potassium hydroxide (liquid caustic potash, AGC Inc.).

[0104] The liquid skin cleanser composition has good foaming performance (foam density) and excellent cleansing sensation, and can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in body soaps.

[0105] This international application claims priority based on Japanese Patent Application No. 2022-207770, filed on December 26, 2022, the entire contents of which are incorporated herein by reference.

Claims

1. It contains (A) an anionic surfactant, (B) a phosphate, and (C) a disinfectant. A liquid skin cleansing composition characterized by having a viscosity of 150 mPa·s or less at 25°C.

2. The liquid skin cleansing composition according to claim 1, wherein the mass ratio of the content of (B) to the content of (C) [(B) / (C)] is 1 or more and 10 or less.

3. The liquid skin cleansing composition according to any one of claims 1 to 2, wherein the component (A) comprises a palmitate salt.

4. (D) monoethanolamine and (E) fragrance are further contained, A liquid skin cleansing composition according to any one of claims 1 to 2, wherein the mass ratio of the content of (D) to the content of (A) [(D) / (A)] is 0.08 or more and 0.5 or less.

5. The content of (A) is 1% by mass or more and 25% by mass or less based on the total amount of the liquid skin cleansing composition. The content of (B) is 0.05% by mass or more and 5% by mass or less based on the total amount of the liquid skin cleansing composition. The liquid skin cleansing composition according to any one of claims 1 to 2, wherein the content of (C) is 0.05% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition.

6. A liquid skin cleansing composition according to any one of claims 1 to 2, which is filled into a foaming container.